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Armor Material Mastery (Armor Mastery, Combat)

Source Armor Master's Handbook pg. 16
You bring the most out of your armor’s special material.

Prerequisites: Armor Material Expertise, base attack bonus +11 or fighter level 8th, armor training class feature.

Benefit: You can use the ability granted by Armor Material Expertise two additional times per day.

Combat Trick (from the Combat Stamina feat)

Source Armor Master's Handbook pg. 20
You can spend 5 stamina points to use an armor material ability without it counting against your daily limit. (See page 16.)